rigid foam under tank

[Bodasifa]

my tank is 36 x 15 x 13. I have a sample 4 x 8 piece of foam coming from one the the suppliers i deal with. It is not the pink or blue stuff , so i will see how this stuff works

[reefwithareefer]

Blue or pink rigid may be too rigid. That type is quite dense and not reallyeant to compress. Home Depot sells a 1/2" foil backed, white, popcorn styrofoam that is less rigid. I used it under my 180 and 300 gal tanks. Comes in a 2ft x 8ft sheet

[Bodasifa]

do you think the standard styrofoam will hold up. The only problem with this stuff is you can't get a nice clean cut. Looks like it is soft enough to compress and fill any gaps. i guess all i can do is try it out, fill the tank and let it sit and see how it reacts

[hillegom]

You can get a nice clean cut with a hot knife.
Or a train transformer and a tungsten wire.

[Bodasifa]

looks like the regular plain 3/4" foam pad did the trick. still a slight gap between foam and stand with only water in. I'm sure once i add the sand and rock and over time once it settles all gaps will be gone

[Myka]

Which type did you end up using? Got a pic?

[Bodasifa]

just plain old regular 3/4" sheet. this was a test piece. once i drain tank again i will cut a nice straight piece that fits perfectly

[Doug]

Originally Posted by reefwithareefer

Blue or pink rigid may be too rigid. That type is quite dense and not reallyeant to compress. Home Depot sells a 1/2" foil backed, white, popcorn styrofoam that is less rigid. I used it under my 180 and 300 gal tanks. Comes in a 2ft x 8ft sheet

Thats correct. I remember reading a tank builders thread on it, that suggested using only the white for the reasons mentioned here. That being said, I once used pink and it seemed fine but mostly the white and use some type of black edging material.